Roll ramming apparatus.



WITNESSES:

H. P. MACDONALD. ROLL RAMMING APPARATUS, APPLICATION FILED 00T.3, 1912.

Patented Apr. 14, 1914.

2 SHEETS-SHEET 1.

I N VENTOR.

A TT ORNE Y.

H. P. MACDONALD. ROLL RAMMING APPARATUS.

APPLICATION FILED 00T.3, 1912.

1,092,844. Patented Apr. 14, 1914.

2 SHEETS-SHEET 2.

WITNESSES. w w v' BY $132 W (f M ROLL RAIVIMING APPARATUS.

Specification of Letters Patent.

Patented Apr. 14, 1914.

Application filed October 3, 1912. Serial No. 723,684.

To all whom it may concern Be it known that I, HARRY P. MACDONALD, a citizen of the United States, residing at Montclair, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Roll Hamming Apparatus, of which the following is a specification.

This invention relates to roll ramming apparatus for ramming sand molds and it has for its primary objects: the provision of improved ramming means whereby sand in the flask is packed to a uniform degree of hardness throughout; the provision of an improved arrangement of roll ramming apparatus whereby a plurality of molds, whether of uniform or irregular configuration, may be rammed by a single operation of the ramming apparatus; and the provision of an improved flexible pad or ramming member adapted to be supported on the flask between the flask and the ramming roll and to pack the sand throughout the mold to a uniform degree of hardness. My invention further contemplates the provision of improved means whereby the sand in the flasks may be rammed to a predetermined degree of hardness. In general, my invention contemplates the provision of a simple and effective form of roll ramming apparatus to attain the objects herein set forth. These, together with such other objects as may hereinafter appear or are in cident to my invention I attain by means of a construction which I have illustrated in preferred form in the accompanying drawings wherein Figure l is a longitudinal section through my improved apparatus and illustrates the ramming of a string of three molds of different configuration; Fig. 2 is a section of the device of Fig. 1 taken on the line IIII of Figure l and partially broken away at the bottom; Fig. 3 is a plan view of Fig. 1; Fig. 4 is a sectional view of a portion of my improved ramming pad drawn on an enlarged scale; and Fig. 5 diagrammatically illustrates the application of my invention to a molding machine of the rockover type.

Referring to Figs. 1, 2 and 3, the principal parts of the apparatus may he enumerated as follows: 1 is the framework which is composed of long side pieces bound together at intervals by girders 23 and provided with upstanding posts 2% which support the tracks 3 in a manner hereinafter to be described. Mounted on the tracks 3 is a heavy ramming roll 2 which is carried in the fork of a long operating arm 4 and is pro vided with grooves 2 adapted to engage the tracks 3 and prevent their spreading apart as the ramming operation progresses. The tracks 3 are preferably hinged to the frame work 1 in such manner as to swing out of the way to permit the ready removal of the molds when the ramming operation is completed. To this end I provide a plurality of links 17 which are fastened at one end to the tracks and are pivotally mounted at the other end to bosses or lugs 19 fastened to the framework, the pivot pins 18 being preferably removable. This construction permits the tracks 3 to be dropped to one side while the flasks are being put on or taken off the machine.

Referring now more particularly to Figures 1 and 3, it will be seen that I have shown a string of three flasks, 7, 7 and 7 in position 011 the machine, the first two flasks having been already rammed while the third flask 7" is being rammed. The flask 7 is substantially square, has a slightly irregular pattern 12, and is supported on a molding machine 10 of the match plate or stripping plate type operated by the lever 26. The flask 7 is circular in form and has an irregular pattern 1%, while the flask 7 is of rectangular shape (see Fig. 3) and has a hump-backed pattern 12'. These flasks are supported by pattern boards 11 carried on cross pieces 14 supported on the stringers 13. Mounted on the respective flasks are upsets or sand retaining frames 8, 8, and 8 which are positioned by means of the lugs 9. The flask 7 and frame Sare humpbacked in vertical section.

In order to secure uniform hardness of the sand throughout the mold flasks, I provide for each flask a flexible pad 0- ramming member comprising a plurality of bars 5 which are preferably composed of wood and are tied together by one or more ropes or flexible cables 6, the bars being spaced apart by washers 6. The pads are placed over the sand frames and are maintained in position by means of links 15-preferably two for each pad which are pivoted at 155 to the innermost bar of the pad in such manner that the top of the links is on a level with the tops of the bars 5. The links 15 are provided at their outer ends with bentover hook portions 15 which engage apertures in the angles plates 16. See particularly Figure 1). When not in use, the roll 2 is carried 011 the stationary portion 3 of the tracks.

Assuming that the flasks and sand frames are in position, the operation is as follows:

The flasks and frames are filled with sand which is struck ofI even with or slightly below the top of the sand frames, after which the pads are placed in position resting on the sand in the frame. The roller 2 is then put in motion and as it travels along the tracks 3 it rides upon the links 15 pushing them downwardly and they in turn force down the first bar of a pad so that when the roller comes to the first bar, it is on a level with the top of the bar. The links 15 thus serve as a bridge to carry the roller to the top of the pad, maintain the pad in proper position in the frames, and prevent the roller from tipping the bars. It will be apparent that in the absence of such a bridging membet, or members, that the roller would have a tendency to push aside the pad rather than ride upon the pad inasmuch as it would strike the first corner only. As the movement of the roller continues, the bars are successively engaged and driven down, the roller engaging but one, or at the most, not more than several of the bars at a time. This operation gives a wave-like motion to the pads as indicated in Figure 1, the ropes 6 being drawn sufliciently tight to hold the bars together but permitting the pad to bend. By this arrangement each bar presses on the sand with equal intensity with the result that the sand is packed to a uniform degree of hardness throughout the flasks. After the flask is rammed, the pads are lifted away, the sand frames are removed, and the flask struck off in the usual manner.

It is also to be observed that by this arrangement, the flasks may be rammed to any predetermined degree of hardness desired by varying the depth of the sand placed in the flasks. It will be readily apparent that the entire weight of the roller does not come on any flask, but that the downward movement of the roller is limited by the tracks 3 and that only a portion of its weight therefore serves to push down the pads to a predetermined position. It therefore follows that by measuring the quantity of the sand in the flasks any desired degree of hardness in packing can be obtained.

Uniformity in ramming is also further obtained by cutting the under side of the bars of a pad to conform to the outline of the pattern. This is shown in Figure 2. When necessary, notched to enable the links 15 to go down the sand frames may be as far as needed (see left hand end of sand frame 8 Figure 1). r

Referring to Fig. 5, it will be seen that I have diagrammatically illustrated the application of my improved construction to a moldin machine of the roll-over type. As

there shown, the flask 7 and .the sand frame 8 are carried on a support pivoted to the frame 25 in such manner that after the flask has been rammed and the frame 8 removed, the flask may be rolled over on to the supporting arms 26 at one side of the machine. are mounted in any preferred manner so as to clear the machine.

It will be readily seen that the apparatus is simple in construction and in operation and that a plurality of flasks of different shapes and sizes may be rammed by one operation. It will also be apparent that the sand may also be packed'todifferent degrees of hardness in the respective flasks. Where the patterns are of great length, several pads may be readily cou led together. Other advantages will occur to those familiar with the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following 1. In roll ramming apparatus the combination of a frame, a flask, a track carried on the frame, a ramming roll carried on the track, a pad above the flask, the top portion of which lies in such relation to the tracks as to be engaged by the roll as the latter is operated, and a bridging member, one end of which is sup orted on the frame and the other on the pad, the said bridging member carrying the roll on the pad as the roll is advanced.

2. In roll ramming apparatus the combination of a flask, a ramming roll, a flexible ramming element resting on' the sand in the flask and adapted to he engaged by the roll as the latter is moved over the flask, and means at an end of said element for maintaining said element in position against the displacing action of the roll and preventing humping up of the flexible element as the roll is advanced from said end over the said element.

3. In a roll ramming apparatus the combination of a roll, a support therefor adapted to support the roll above a flask, and a flexible pad between the flask and the roll in position to be engaged by the roll as it is operated, said pad comprising a plurality of bars, means for spacing the bars apart, and a cable for bindingthe bars together.

In this construction the tracks 3 1. In roll ramming apparatus the combioperated, said pad comprising a plurality of bars, means for spacing the bars apart, and a plurality of cables for binding the bars together.

5. In roll ramming apparatus the combination of a ramming roll, a flask, a frame, a track carried by the frame and adapted to support the roll above the flask, a sand compression pad between the flask and the roll adapted to be engaged by the roll as the latter is operated, and means for maintaining the pad in position comprising a pair of bars supported on the frame at one end and fastened to the pad at the other end.

6. In roll ramming apparatus the combination of a ramming roll, a flask, a frame, a track carried by the frame and adapted to support the roll above the flask, a sand compression pad between the flask and the roll adapted to be engaged by the roll as the latter is operated, and means for maintaining the pad in position comprising a pair of bars supported on the frame at one end and pivotally fastened to the pad at the other end.

7. In roll ramming apparatus the combination of a ramming roll, a flask, a frame, a track carried by the frame and adapted to support the roll above the flask, a sand compression pad between the flask and the roll adapted to be engaged by the roll as the latter is operated, and means for maintaining the pad in position comprising a bar pivoted at one end to the pad and provided at its other end with means for engaging the frame. 7 8. In mold ramming apparatus, a flask, a ramming means having progressive movement over the flask, and a flexible sand compressing member located between the flask and the ramming means, said member comprising a plurality of bars placed adjacent to one another and a flexible means for binding the bars together, whereby the bars have relative vertical movement of translation.

9. In roll ramming apparatus the combination of a ramming roll, a flask, a support for the roll adapted to support the roll over the flask, a pad resting on the sand to be rammed and adapted to be engaged by the roll as the latter is operated, and a bridging member adapted to be engaged by the roll and press down, one edge of the pad as the roll advances.

10. In roll ramming apparatus the combination of aramming roll, a flask, a support for the roll adapted to support the roll over the flask, a pad resting on the sand to be rammed and adapted to be engaged by the roll as the latter is operated, and a bridging member adapted to be engaged by the roll and press down one edge of the pad precedent to the initial engagement of the roll with the pad.

11. In roll ramming apparatus the combination of a ramming roll, a flask, a support for the roll adapted to support the roll over the flask, a flexible pad resting on the sand to be rammed and adapted to be engaged by the roll as the latter is operated, and a bridging member adapted to be engaged by the roll and press down one edge of the pad as the roll advances.

12. In roll ramming apparatus the combination of a ramming roll, a flask, a support for the roll adapted to support the roll over the flask, and a plurality of bars resting on the sand to be rammed having their vertical edges substantially abutting and having relative vertical movement of translation adapted to be engaged by the roll as the latter is advanced.

13. In roll ramming apparatus the combination of a ramming roll, a flask, a support for the roll adapted to support the roll over the flask, a pad resting on the sand to be rammed and adapted to be engaged by the roll as the latter is operated, said pad com prising a plurality of bars secured together for slight relative movement, and a bridging member, one end of which is carried on the pad and the other on the support, said member being engaged by the roll as it is advanced and being adapted to press down the first bar precedent to the initial engagement of the roll with the pad.

14. In mold ramming apparatus the combination of a ramming roll, a platform for supporting the roll, a flask located adjacent the platform, a ramming pad over the flask in position to be engaged by the roll as the latter is advanced from the platform, and a bridging member adapted to carry the roll from the platform onto the pad, said member being supported at its inner end on the pad.

15. In mold ramming apparatus the combination of a ramming roll, a platform for supporting the roll, a flask located adjacent the platform, a ramming pad over the flask in position to be engaged by the roll as the latter is advanced from the platform, and a bridging member adapted to carry the roll from the platform onto the pad, said pad comprising a plurality of bars which are successively engaged by the roll, and said bridging member being supported at its inner end on one of the said bars.

In testimony whereof I have hereunto signed my name in the presence of the two subscribing witnesses.

HARRY P. MACDONALD.

IVitnesses:

CLAYTON C. GREENLEE, Jr., LOUIS R. STAGG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents,

. Washington, D. C. 

